Nat Firewall

Comodo Memory Firewall
Free - Comodo Group

Free Comodo Memory Firewall adds another critical layer of security to home and business PC’s by monitoring for and preventing most types of buffer overflow attacks. These attacks occur when a malicious program or script addresses more data to its memory buffer than it can store. The goal of most attacks is to destabilize the system then install malware onto the victim PC in order to execute a range of attacks such as identity and data theft.

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Trustix Enterprise Firewall
Free - Trustix

Trustixâ„¢ Enterprise Firewall, protects assets and business transactions by ensuring fast, secure connections with the Internet and networks. It enables fast, controlled connectivity, providing strong protection against unwanted intrusion without slowing the flow of approved traffic. Supports businesses with highly sophisticated networks and also those just requiring basic email, Web browsing. An essential security component for today's ebusiness

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Routix NetCom
Free - Routix software

Easy-to-use packets-level filtering. NetCom is an extensible firewall, traffic controller, QoS, Bandwidth shaper, URL filtering, Bridging, Redirection, NAT and traffic statistics software for the Microsoft Windows. Fully scriptable.

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